Dynamic OBSS PD Level Selection for Wi-Fi Throughput
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Solution Overview
Problem
Existing Wi-Fi networks face challenges in optimizing throughput due to the selection of the OBSS Packet Detection (PD) level, which affects channel usage and transmission power, leading to inefficient data transmission in non-Spatial Reuse Group (SRG) environments.
Innovation Solution
A method is introduced to select an optimal OBSS PD level that minimizes the linear combination of estimated average contention time and transmission time, using data samples to calculate and adjust the PD level dynamically, ensuring efficient data transmission by considering the transmit power requirements of the receiver station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the OBSS PD level is increased above the received interference level, then the channel can be considered clear and transmit power can be maintained, but the received interference cannot be disregarded and concurrent transmission may disrupt ongoing OBSS transmission
Solution Approach 1:
The patent dynamically adjusts the OBSS PD level parameter based on received interference measurements. Instead of using a fixed PD level, the system calculates an optimal PD level by comparing received OBSS signal strength against a threshold, allowing the parameter to adapt to changing channel conditions and interference levels, thereby resolving the contradiction between maintaining throughput and avoiding harmful interference
Solution Approach 2:
The system implements a feedback mechanism where the received interference level from OBSS transmissions is continuously monitored and used to adjust the OBSS PD level. This closed-loop control allows the system to respond to actual channel conditions, adjusting the detection threshold based on measured interference to optimize both throughput and interference management
2Power
If the OBSS PD level is set to minimum value, then transmit power can be high with higher data rate, but the channel is more likely to be assessed as busy resulting in higher average contention time
Solution Approach 1:
The patent transforms the static OBSS PD level into a dynamic parameter that adjusts based on real-time channel conditions. The system continuously evaluates received interference levels and modifies the PD level accordingly, allowing transmit power and contention time to be optimized adaptively rather than being fixed at minimum values, thus resolving the trade-off between power and time
3Loss of time
If the OBSS PD level is set to maximum value, then the channel can be considered clear with lower contention time, but the transmit power is capped at minimum level reducing data rate
Solution Approach 1:
The system dynamically adjusts the OBSS PD level parameter based on measured interference conditions, avoiding the extreme of maximum fixed values. By calculating an optimal PD level that reflects actual channel state, the system achieves balanced contention time and data rate performance, resolving the contradiction between reduced time loss and maintained speed
Data Source
AI summary
Methods, devices, and processor readable media for enabling a device operating within a wireless network to select an OBSS PD level that allows transmission of physical (PHY) layer protocol data units (PPDU) in minimum time and thereby enhancing the throughput of the network. An optimal OBSS PD level may be identified as the level that minimizes a linear combination of an estimated average contention time and an estimated average transmission time. The estimated contention time and estimated transmission time may be calculated based on data samples recorded at the given OBSS PD level. If insufficient data samples have been collected at the given OBSS PD level, then data samples from other OBSS PD levels may be used to estimate the average.